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P‐12: The Effect of Character Size and Contrast on Performance in Pseudo‐text and Letter‐search Tasks
Author(s) -
Mustonen Terhi,
Törn Lars,
Häkkinen Jukka
Publication year - 2002
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1830241
Subject(s) - contrast (vision) , character (mathematics) , task (project management) , computer science , visual search , artificial intelligence , mathematics , geometry , engineering , systems engineering
Abstract The purpose of the study was to compare pseudo‐text and letter‐search tasks in studying character sizes in different contrast conditions. Four character sizes (0.14, 0.16, 0.22, and 0.24 deg) and two contrast levels (C Michelson equals;0.06 and C Michelson equals;0.99) were used. According to the results, search performance improved with increasing character size and contrast in both tasks. Contrast had more effect on performance in the letter‐search task than in the pseudo‐text task. Consequently, the letter‐search method may be better for investigating small displays in bright lighting conditions, which usually cause low contrast in displays. However, the use of the pseudo‐text method is less time‐consuming because the results were less variable.